(Spartan-117)
(John-117)
Master Cheif is a fictional character featured in the video games Halo: Combat Evolved and Halo 2, and the novels Halo: The Fall of Reach, Halo: The Flood, and Halo: First Strike.
The Master Cheif is the only person that can save earth along with the help of the last marines on earth.

;genetically and cybernetically augmented warrior designed to put down rebels and insurgents within the United Nations Space Command.

7' tall and weighs approximately 1,000 pounds in full battle armor. He is approximately forty-one years old at the time of the events of Halo: Combat Evolved (2552). Between Halo: Combat Evolved and Halo 2, the Chief's armor is upgraded from MJOLNIR Mark V to Mark VI. Both iterations of the armor include a helmet with reflective visor so the face of the Chief is never seen: in spite he is seen removing his helmet once in each game, the camera view always conceals the Master Chief's face from the viewers. Master Chief is voiced by Steve Downes in both Halo: Combat Evolved and Halo 2.

Marine to Master Cheif: "We called for reinforcments, but we did'nt expect A Spartan!"